对 Si Cw/MB1 5镁基复合材料的超塑性变形行为进行了研究。结果表明 :Si Cw/MB1 5镁基复合材料在 340℃ ,应变速率为 1 .66× 1 0 - 2 s- 1变形条件下 ,断裂延伸率达到 2 0 0 % ,应变速率敏感性指数 m为 0 .35;超塑性变形后基体中出现了许多空洞和近似平行于断口的细小裂纹 ;晶须在基体中随机排布 ,失去了变形前轴向平行于挤压方向的特点 ,说明基体晶粒在变形中发生了滑动。 The superplastic deformation behaviors of Si Cw / MB1 5 magnesium matrix composites were studied. The results show that the elongation at break of Si Cw / MB1 5 magnesium matrix composites reaches 200% at 340 ℃ and strain rate of 1.66 × 10-2 s-1, and the strain rate sensitivity index m is 0 .35; superplastic deformation of the matrix after the emergence of many holes and cracks parallel to the fracture line; whiskers randomly arranged in the matrix, the loss of deformation parallel to the axial direction parallel to the extrusion characteristics of the matrix grains Slippage occurred during deformation.